DOOMSDAY

doomsday. Doomsday, n. the day of judgment, the last day

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Dooms″day′ (?), n. [[AS. d�mes dāg. See Doom, and Day.]] 1. 1. A day of sentence or condemnation; day of death. “My body's doomsday.” Shak.
2. 2. The day of the final judgment.
I could not tell till doomsday. Chaucer. Doomsday Book. See Domesday Book.